What are some real life applications of generators in Javascript? | Sololearn: Learn to code for FREE!
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What are some real life applications of generators in Javascript?

Generators

21st Jul 2020, 5:06 PM
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7 ответов
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Generators are like lists but you don't have to generate the whole list at once which potentially saves time. function* foo () { for (let i = 0; i < 100; i++) yield long_computation(i); } Now, `[...foo()]` gives a list of length 100 with all the results but you can also stop earlier: for (let value of foo()) if (value < 0) break; This is better than generating the whole list which takes a long time and then throwing away the last 90 elements! Some things we can do with generators: - Infinite generators, like a generator that generates all possible prime numbers, one after the other. - Take input multiple times: function* chatBot() { const age = yield "Please enter your age: "; const name = yield "And your name: "; return "Thanks!"; } let bot = chatBot(); let input, msg; while (true) { let { value, done } = bot.next(input); msg = value; if (done) break; input = prompt(msg); } alert(msg); And many other things but I'm running out of space.
21st Jul 2020, 7:40 PM
Schindlabua
Schindlabua - avatar
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Schindlabua yeah thanks. I understand generators but I don't know how useful they are. For example when I learned promises, I applied it in nodejs when I was working with APIs but for generators, apart from infinitely producing some values one at a time, I don't know other applications of it.
21st Jul 2020, 8:16 PM
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Schindlabua Thanks very much 😊 ❤️
21st Jul 2020, 9:07 PM
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Andrei I es6 generators
21st Jul 2020, 7:02 PM
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Edward We can draw parallels here. If promises are a replacement for nodejs-style callbacks, then generators can serve as a replacement for finite-state machines. And those are everywhere. Say in a function that models a game of chess you would need to pass in whose turn it is, as an argument, but a generator can just remember it. I think generators are a bit under-utilized and not so mainstream (yet!) and so they don't come up in my day-to-day programming a lot either. But you can find many cool applications for them if you keep an eye out. (Performance is pretty bad if you yield a lot so that sucks) Also nice: async generators are a thing now so we have even more ways to deal with Promises and such. Another tool in the toolbox am I right :)
21st Jul 2020, 8:59 PM
Schindlabua
Schindlabua - avatar
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Generators of what?
21st Jul 2020, 6:16 PM
Andrei I
Andrei I - avatar
+ 2
Mirielle That sounds plausible. Thanks a lot. 😊😊
22nd Jul 2020, 3:12 AM
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